INTERNAL COMBUSTION ENGINE WITH SLOT-TYPE GAS DISTRIBUTION

摘要

The present invention pertains to the field of engine construction and relates to internal combustion engines with slot-type scavenging and more precisely to two-stroke engines. At the beginning of the exhaust stroke, the exhaust gases are expelled from the engine cylinder (4) through inlet/outlet ports (11), inlet/outlet passages and slide valves (8) into an exhaust pipe (14). Scavenging ports (9) are then uncovered by an upper edge of the piston (5) and used to feed a fresh charge into the cylinder (4) from the crank chamber (2) while the cylinder (4) cavity is scavenged. After expelling the exhaust gases from the cylinder cavity, the slide valves (8) rotate to interrupt the communication between the cylinder (4) cavity and exhaust manifold (14). Upon further rotation of the slide valves (8), the cylinder (4) cavity is connected with the inlet pipe through the same gas-distribution organs used for the exhaust gas outlet, i.e. the inlet/outlet ports (11), the inlet/outlet passages and the slide valves (8). A fresh charge can thus be fed into the cylinder (4) through all the ports it comprises, whereby the cylinder of a two-strike engine may be charged without any losses in the charges and with the appropriate preliminary compression ratio. A fresh charge is fed into the crank chamber (2) using the same ports (11), passages (12) and slide valves (8) only after a port (11) is uncovered by the lower edge of the piston (5) when it moves from the bottom dead centre. This economical engine structure may be used to obtain maximum specific parameters, while the absence of losses in the charges prevents the degradation of the resources. This structure also allows for the forced aspiration of the cylinders and ensures effective internal cooling of the hottest parts in the engine.